feat(transformer/class-properties): add debug_assertions for declare class

[Dunqing]

Follow up on #13766 (comment). declare classes have already been removed in TypeScript's enter_statements, so no declare classes will enter the class-properties plugin. Add a few debug_assertions to ensure this won't break in the future.

[Dunqing]

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• feat(transformer/class-properties): add debug_assertions for declare class #13907 👈 (View in Graphite)
• refactor(transformer/typescript): remove declare declarations and type-only declarations earlier #13908
• main

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[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #13907 will not alter performance

_{Comparing 09-19-feat_transformer_class-properties_add_debug_assertions_for_declare_class (c4f2d8c) with 09-19-refactor_transformer_typescript_remove_integer_10_readonly_81999_integer_10_readonly_0_integer_10_readonly_81952_array_readonly_readonly_-569jnrxghikls_0__bin_zsh_integer_10_readonly_0_array_readonly_integer_10_readonly_argc_0 (c5c1672)}

Summary

✅ 37 untouched